Abstract
The phenomenon of avalanche-gain variations over time, particularly in Micro Pattern Gaseous Detectors (MPGD) incorporating insulator materials, have been generally attributed to electric-field modifications resulting from "charging-up" effects of the insulator. A robust methodology for characterization of gain-transients in such detectors is presented. It comprises three guidelines: detector initialization, long gain-stabilization monitoring and imposing transients by applying abrupt changes in operation conditions. Using THWELL and RPWELL detectors, we validated the proposed methodology by assessing a charging-up/charging-down model describing the governing processes of gain stabilization. The results provide a deeper insight into these processes, reflected by different transients upon abrupt variations of detector gain or the irradiation rate. This methodology provides a handle for future investigations of the involved physics phenomena in MPGD detectors comprising insulating components.
Original language | English |
---|---|
Article number | P09036 |
Journal | Journal of Instrumentation |
Volume | 12 |
Issue number | 9 |
DOIs | |
State | Published - 29 Sep 2017 |
Externally published | Yes |
Keywords
- Avalanche-induced secondary effects
- Charge transport and multiplication in gas
- Micropattern gaseous detectors (MSGC, GEM, THGEM, RETHGEM, MHSP, MICROPIC, MICROMEGAS, InGrid, etc)
ASJC Scopus subject areas
- Instrumentation
- Mathematical Physics